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                        <h1>Chrome</h1>
                        <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="#" role="button"
                                target="_blank">点我下载</a>
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                        <h1>Firefox</h1>
                        <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="#" target="_blank" role="button">点我下载</a>
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                        <h1>Safari</h1>
                        <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="#" target="_blank" role="button">点我下载</a>
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                        <h1>Opera</h1>
                        <p>Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="#" target="_blank" role="button">点我下载</a>
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                        <h1>IE</h1>
                        <p>Internet Explorer，简称 IE，是微软公司推出的一款网页浏览器。</p>
                        <p>
                            <a class="btn btn-lg btn-primary" href="#" target="_blank" role="button">点我下载</a>
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                        <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
                        <p>
                            <a href="#" class="btn btn-primary" role="button">点击下载</a>
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                        <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
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                            <a href="#" class="btn btn-primary" role="button">点击下载</a>
                        </p>
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                    <img src="images/safari-logo-small.jpg">
                    <div class="caption">
                        <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
                        <p>
                            <a href="#" class="btn btn-primary" role="button">点击下载</a>
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                    <a href="#tab-firefox" aria-controls="tab" role="tab" data-toggle="tab">Firefox</a>
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                            <h2 class="feature-heading">Google Chrome <span class="text-muted">使用最广的浏览器</span></h2>
                            <p class="lead">Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。
                                该浏览器是基于其他开源软件所撰写，包括WebKit，目标是提升稳定性、速度和安全性，并创造出简单且有效率的使用者界面。</p>
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                            <img class="feature-image img-responsive" src="images/chrome-logo.jpg" alt="Chrome">
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                            <img class="feature-image img-responsive" src="images/firefox-logo.jpg" alt="Firefox">
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                            <h2 class="feature-heading">Mozilla Firefox <span class="text-muted">美丽的狐狸</span>
                            </h2>
                            <p class="lead">Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器，
                                使用Gecko引擎（非ie内核），支持多种操作系统如Windows、Mac和linux。</p>
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                            <h2 class="feature-heading">Safari <span class="text-muted">Mac用户首选</span></h2>
                            <p class="lead">Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器，使用了KDE的KHTML作为浏览器的运算核心。
                                Safari在2003年1月7日首度发行测试版，并成为Mac OS X v10.3与之后的默认浏览器，也是iPhone与IPAD和iPod touch的指定浏览器。</p>
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                            <img class="feature-image img-responsive" src="images/safari-logo.jpg" alt="Safari">
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                            <img class="feature-image img-responsive" src="images/opera-logo.jpg" alt="Opera">
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                            <h2 class="feature-heading">Opera <span class="text-muted">小众但易用</span>
                            </h2>
                            <p class="lead">Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。
                                是跨平台浏览器可以在Windows、Mac和Linux三个操作系统平台上运行。.</p>
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                <div class="tab-pane" id="tab-ie">
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                            <h2 class="feature-heading">IE <span class="text-muted">你懂的</span></h2>
                            <p class="lead">Internet Explorer，原称Microsoft Internet Explorer(6版本以前)和Windows Internet
                                Explorer(7，8，9，10版本)，
                                简称IE，是美国微软公司推出的一款网页浏览器。它采用的排版引擎(俗称内核)为Trident。</p>
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                            <img class="feature-image img-responsive" src="images/ie-logo.jpg" alt="IE">
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